“Mara Salvatrucha, more commonly known as MS-13, is a mostly South American gang that’s notorious for its viciousness.

In the states, they’ve attacked people with machetes, murdered individuals, and participated in human trafficking and human smuggling. In El Salvador, their brutality has turned the country into the murder capital of the world, via The New York Times.

MS-13 isn’t just a small group of criminals, though. In 2012, the street gang that started in Los Angeles in the 1980s was designated a transnational criminal organization. It’s the only street gang to be afforded such a title.

President Donald Trump and Attorney General Jeff Sessions promised a crackdown on MS-13 here in the U.S., and they are delivering on that promise. In fact, a big bust happened in Long Island and New York City this week. In Long Island, MS-13 has committed a string of murders.

Federal officials have rounded up close to 40 accused members of MS-13 in New York City and Long Island in the 30 days following vows by Trump and Attorney General Jeff Sessions to crack down on the gang, known for terrorizing immigrant communities.

Of the 45 New York-area gang arrests over the last month by US Immigration and Customs Enforcement and Homeland Security, 39 were affiliated with MS-13, which has been blamed for a string of recent murders in normally placid Long Island, the feds said.